Have you had 1 or more normal-size to large stools that are mostly black or bloody?

Have you had 1 or more normal-size to large stools that are partly black or bloody?

Have you had 1 or more small stools that are mostly black or bloody?

Have you had streaks of blood in your stools?

If you have answered "No" to the above questions, go back to Check Your Symptoms and continue to answer the questions to evaluate your symptoms.

Do you have a fever of or higher?

Do you think you have a high fever but you are unable to measure your temperature?

Do you have a fever of or higher?

Do you think that you have a moderate fever but you are unable to measure your temperature?

Do you have a moderate fever with signs of a serious illness?

Have you had a recurrent or ongoing fever without an obvious cause after traveling outside your own country in the past 6 weeks?

Do you have diabetes?

Do you have a disease or take medicine that causes problems with your immune system?

Have you had a fever of or higher for longer than 24 hours?

Do you think that you have had a mild fever for longer than 24 hours but you have been unable to measure your temperature?

If you have answered "No" to the above questions, go back to Check Your Symptoms and continue to answer the questions to evaluate your symptoms.

Do you have symptoms of moderate dehydration?

Have you had severe diarrhea for 24 hours or longer?

Do you have vomiting that makes it hard to drink enough to replace the lost fluids?

Do you have diabetes?

Do you have a disease or take medicine that causes problems with your immune system?

Do you have symptoms of mild dehydration for longer than 48 to 72 hours?

If you have answered "No" to the above questions, go back to Check Your Symptoms and continue to answer the questions to evaluate your symptoms.

Do you have symptoms of moderate dehydration, and you are unable to drink enough to replace the lost fluids?

Do you have symptoms of mild dehydration for longer than 12 hours, and you are unable to drink enough to replace the lost fluids?

If you have answered "No" to the above questions, go back to Check Your Symptoms and continue to answer the questions to evaluate your symptoms.

Do you have moderate diarrhea that has not improved after 48 hours of home treatment?

Have you had mild diarrhea for 1 to 2 weeks?

If you have answered "No" to the above questions, go back to Check Your Symptoms and continue to answer the questions to evaluate your symptoms.

Did your diarrhea start after an increase in a dose of medicine or after taking a new medicine?Note: Call the doctor who prescribed the medicine to determine if you should stop taking the medicine or take a different one. An appointment may not be necessary.If you are taking a nonprescription medicine, stop taking the medicine. Call your doctor if you feel you need to continue taking the medicine.

Did your diarrhea start after starting treatment with an antibiotic?

Did your diarrhea start within 2 weeks of stopping treatment with an antibiotic?

Do you think your diarrhea may be caused by a medicine you take regularly, such as lithium or digoxin?

If you have answered "No" to the above questions, go back to Check Your Symptoms and continue to answer the questions to evaluate your symptoms.

You have answered "Yes" to a question that indicates you may need immediate care. Call your health professional now to discuss your symptoms and arrange for your care.

• Symptoms are likely to worsen without medical care.
• If you do not have a health professional, seek emergency care.
• Emergency transportation is not needed. However, if you are not able to travel safely either by driving yourself or having someone else drive you, call an ambulance.

You do not need to answer any of the other questions.

You have answered "Yes" to a question that indicates you need to call your health professional to discuss your symptoms and arrange for care.

• An appointment today is usually needed.
• Symptoms are unlikely to improve without medical care.

Return to the Check Your Symptoms section and answer the questions. You may need to see a health professional sooner if you have other more serious symptoms.

You have answered "Yes" to a question that indicates you may wait to see if your symptoms improve over the next 24 hours (or the specified time period). If symptoms improve, no appointment is needed.

• If symptoms do not improve after 24 hours (or the specified time period), an appointment within the next 24 hours is usually needed.
• If appropriate, try home treatment to relieve your symptoms.
• Check your symptoms in 24 hours, or sooner if there is any change.
• Call your health professional if symptoms get worse.

Return to the Check Your Symptoms section and answer the questions. You may need to see a health professional sooner if you have other more serious symptoms.